The Garmin Virb Can Shoot 5.7K Raw images
but the VIRB Edit application cannot Stitch the circular images
It can be easily done in PTGui 11 PRO or Kolor Autopano Giga
Watch the small Screen cast on the link or image below

https://svendus.se/virb-ptgui-stritching/
Note: you can download the PTGui template on the link below the image